IBM BladeCenter HS21 Series Problem Determination And Service Manual page 14

Statement 4:
≥ 18 kg (39.7 lb.) ≥ 32 kg (70.5 lb.) ≥ 55 kg (121.2 lb.)
CAUTION:
Use safe practices when lifting.
Statement 5:
CAUTION:
The power control button on the device and the power switch on the power
supply do not turn off the electrical current supplied to the device. The device
also might have more than one power cord. To remove all electrical current
from the device, ensure that all power cords are disconnected from the power
source.
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BladeCenter HS21 Types 1885 and 8853: Problem Determination and Service Guide